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          Canal客户端连接
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        <blockquote>
<p>目标：顺利把canal运行起来<br>俗话说：磨刀不误砍柴功，所以先从搭建canal开始</p>
</blockquote>
<p>配置：centos7，mysql5.6</p>
<h3 id="1-mysql开启binlog"><a href="#1-mysql开启binlog" class="headerlink" title="1. mysql开启binlog"></a>1. mysql开启binlog</h3><a id="more"></a>
<p>进入/etc/my.cnf </p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">log-bin&#x3D;mysql-bin #添加这一行就ok</span><br><span class="line">binlog-format&#x3D;ROW #选择row模式</span><br><span class="line">server_id&#x3D;1 #配置mysql replaction需要定义，不能和canal的slaveId重复</span><br></pre></td></tr></table></figure>
<p>输出的binlog长这幅鸟样：<br><img src="https://olwr1lamu.qnssl.com/binlog.png" width="50%" height="50%" alt="binlog.png"/></p>
<h3 id="2-下载Canal并且配置"><a href="#2-下载Canal并且配置" class="headerlink" title="2. 下载Canal并且配置"></a>2. 下载Canal并且配置</h3><p>配置Canal的instance.properties。而canal.properties在简单测试的时候不需要配置：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">canal.instance.dbUsername &#x3D; canal #一般会给canal一个有读权限的账号</span><br><span class="line">canal.instance.dbPassword &#x3D; canal</span><br><span class="line">canal.instance.defaultDatabaseName &#x3D; canalTest #需要监听的数据库</span><br><span class="line">canal.instance.connectionCharset &#x3D; UTF-8</span><br></pre></td></tr></table></figure>
<p>进入canal目录中，启动sh bin/startup.sh.<br>之后会在logs目录下面产生两个目录:canal和example，example对应的是mysql实例。主要看下canal目录下的log，是否正确启动。<br>启动后输出的log:<br><img src="https://olwr1lamu.qnssl.com/canal-log.png" alt="binlog.png"/></p>
<h3 id="3-启动Canal客户端连接Server"><a href="#3-启动Canal客户端连接Server" class="headerlink" title="3. 启动Canal客户端连接Server"></a>3. 启动Canal客户端连接Server</h3><p>启动CanalConnector</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">CanalConnector connector = CanalConnectors.newSingleConnector(<span class="keyword">new</span> InetSocketAddress(<span class="string">&quot;10.211.55.7&quot;</span>,<span class="number">11111</span>), <span class="string">&quot;example&quot;</span>, <span class="string">&quot;&quot;</span>, <span class="string">&quot;&quot;</span>);</span><br><span class="line"><span class="comment">// 服务器IP，虽然在我的canal的log输出了一个25x.x.x.x：11111的ip，但是这里还是服务器ip，后面两个字段不需要填，就是&quot;&quot;</span></span><br></pre></td></tr></table></figure>
<p><strong>如果提示canal connection refuse</strong><br>关闭防火墙！！（血的教训）<br>随后测试操作数据库，客户端会显示数据：<br><img src="https://olwr1lamu.qnssl.com/canal%E5%AE%A2%E6%88%B7%E7%AB%AFlog.png" alt="binlog.png"/></p>

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